Grinding-machine.



PATBNTED DEG. 18, 190s.l H. LUTTER a; E. A. GIE'S.

GRUNDING MACHINE.'

APPLIOATION FILED sBPT.22,19o5.

UNITED STATES ATENT ENCE.

GRlNDlNG-NIACHINE.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed September 22, 1905. Serial No. 279,654.

T [ZZZ whom, it m/rty cm1/cern:

Be it known that we, HERMAN LUTTER and ERNST A. Gries, citizens of the United States, residing at Milwaukee, in the county of Milwaukee and State of /Visconsin, have invented certain new and useful lmprovements in Grindingwachines, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

The main objects of this invention are to supply the working face of a grinding-wheel with water by means of a blast or jet of air, to prevent an excessive supply of water being taken up by the wheel and thrown oif therefrom by centrifugal force, to avoid the injurious eiiects of the grit and other refuse matter contained in the water on the pump employed to throw the water against the wheel, and generally to improve the construction and operation of apparatus of this class.

It consists in certain novel features of construction and in the peculiar arrangement and combinations of parts hereinafter particularly described, and pointed out in the claims.

ln the accompanying,drawings like characters designate the same parts in the several figures.

Figure l is a side elevation of a grinding-` machine embodying the invention, parts being broken away and shown in vertical section. Fig. 2 is a vertical cross-section of the machine on the line 2 2, Fig. l. Fig. 3 is a plan view ofthe machine, parts being broken away and shown in horizontal section. Fig. 4 is a detail view of a pump which ordinarily forms a part of the apparatus, the front or cover plate being removed, and Fig. 5 is a sectional detail view of a modification of the nozzle.

c designates a box case or frame formed or provided with a water-tank l) and at the top and front with a basin c for catching water thrown from the grinding-wheel and returning it into the tank. It is also provided at the top and at the sides with bearings CZ, in which is mounted the arbor e of the grindingwheel f. The upper part of the grindingwheel is covered by the usual hood g.

On one side of the case a is mounted an air-pump h, which may be of the usual or any suitable kind for producing an air-blast. As being well adapted for the purpose a rotary pump is shown having a cylindrical case i and a circular head y', eccentrically mounted in the case and provided with radial blades or wings k, which are pressed outwardly and held in contact with the peripheral wall of the case by an interposed spring Z or by centrifugal force. The discharge port or passage m, leading tangentially out of the case, as shown in Fig. 4, is connected by a pipe o with an air-blast nozzle p, which terminates, as shown in Figs. l and 2, below the normal water-level in the tank l) and is directed upwardly toward the grinding-wheelf The pump-case is formed in its periphery opposite the discharge-port m with an inletport Q, as shown in Fig. 4. The shaft of the rotary head is provided with a pulley s, which is connected by a belt with a similar pulley t on the grinding-wheel arbor e.

A forked treadle-lever u, fulcrunied at o to the sides of the case c near its base, is connected by a rod w with an arm which is pivoted at one end on the pump-case i concentrically with the shaft of the head j and is provided at the opposite end with a belttightening pulley y. The arm :v and pulley 'y are held by gravity in their lower position, leaving the belt passing around the pulleys s and t slack, while the lower end of the rod w rests on the base of the case c, thus serving as a stop to limit the downward movement of pulley y. The case a is provided at the bottom of the tank l) with a drain-pipe z for drawing oil the water and the dirt which collects in the tank. This drain-pipe may be plugged, as shown, or provided with a stopcock.

Referring to Fig. 5, showing a modification of the nozzle, the air-blast nozzle p projects above the normal water-level in tank l) and is surrounded by a tube n, which has an intake-opening below the water-level and extends at its upper end, which has a contracted opening, above the discharge-orifice in the upper end of said nozzle p.

The machine operates as follows: The grinding-wheel being rotated in the direction indicated by the arrow in Fig. l, the depression of the treadle u moves the pulley yy up against the belt and tightens it on the pulleys s and t, thereby starting the pump, which forces air through the pipe 0 and nozzle p into the tank b below the water-level therein. The upwardly-directed air blast or jet issuing from the nozzle carries water with it up against the peripheral face of the grinding-wheel f. The force of the air blast or jet, and hence the quantity of water carried IOO by it against the face ofthe grinding-wheel, is regulated by depressing the treadle u more or less, thereby varying the tension or tautness of the beltv and the speed of the pump. Whenever the treadle is released by the operator, the pulley y drops to its normal position, as shown in Fig. l, thereby automatically stopping the pump and the supply of water to the grinding-wheel As grindingwheels of this kind are frequently left running when they are not in use, this provision for automatically stopping the pump is desirable, because it avoids unnecessary wear of the pump.

I/Vith the form of nozzle shown vin Fig. 5 the air blast or jet issuing from the nozzle p above the water-level acts on the ejector principle to draw water up into the surrounding tube n and to force it therefrom against the face of the grinding-wheel, the result being the same as with the other form of nozzle.

By the employment of a regulated blast or jet of air, as above explained, a stream or surge of water `is carried upwardly against the working face of the grinding-wheel, wetting it sufficientiy for all practical purposes, but without excess in the supply, which would otherwise be carried up with and thrown off from the wheel by centrifugal force. The water thus thrown against the face of the grinding-wheel washes grit and chips or particles of metal and refuse matter therefrom, keeping it in a clean and proper condition for work.

The blast or jet of air for throwing the water against the grinding-wheel may be supplied from any convenient source, such as an air-compressor or compressed-air reservoir; but ordinarily an air-pump attachedto the machine itself is desirable. Any kind of an air pump or blower capable of producing a sufiiciently strong blast through the nozzle may, however, be employed.

The strength of the air-blast and the force of the stream or surge of water produced thereby may be regulated in various ways by varying the speed of the pump, as above eX- plained, or by varying the supply of air t0 the pump or to the nozzle with a valve.

Various changes in the details of construction and arrangement of parts other than those hereinbefore mentioned may be made without departing from the principle and intended scope of the invention.

We claiml. In a grinding-machine, the combination of a grinding-wheel, a water-tank adjacent to said wheel, an air-blast nozzle arranged to impel a jet of water from said tank against said wheel, an air-blast nozzle arranged to impel water therefrom against said wheel, and an air-pump having an air-delivery connection with saidnozzle and a driving connection with the grinding-wheel arbor, substantially as described. y

4. In a grinding-machine the combination of a grinding-wheel, a water-tank, an air-blast pipe terminating below the normal waterlevel in said tank and arranged to elevate water therefrom against said wheel, a pump for forcing air through said pipe, and means for regulating the air-blast delivered from said pipe into said tank, substantially as described.

5. In a grinding-machine the combination of a grinding-wheel, a water-tank, an airblast pipe arranged to elevate water from said tank against said Wheel, an air-pump having a driving connection with the grinding-wheel arbor for forcing air through said pipe, and a treadle arranged to control said driving connection for starting and regulating the speed of the pump, substantially as described.

l 6. In a grinding-machine the combination of a grinding-wheel, a water-tank, an airblast pipe arranged to elevate water from said tank against said wheel, a rotary airpump connected by a belt and pulleys with the grinding-wheel arbor and having its discharge-port connected with said pipe, a belttightening pulley and a treadle connected with said pulley and adapted to force it with more or less pressure against said belt for regulating the speed of the pump and the strength of the air-blast, substantially as described.

In witness whereof we hereto aHiX our signatures in presence of two witnesses.

HERMAN LUTTER. ERNST A. GIES. Witnesses:

CHAs. L. Goss. MAUDE L. EMERY.

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